The terms magari yari and jumonji yari are applied to spears with additional blades; the latter term means ‘cross-shaped’.
This is an unusual and ostentatious example, with two extra blades of different shapes, possibly influenced by a European halberd. It is from the Edo period so was probably used for display.
Japanese, 18th century
On loan from Victoria and Albert Museum
Published in R. Knutsen, Japanese polearms, London, 1963, 136-7, no. 17.
Victoria and Albert Museum